assertSame(handler, indexUpdater.getUncaughtExceptionHandler());
    }

    // Test setDefaultUncaughtExceptionHandler
    @Test
    public void test_setDefaultUncaughtExceptionHandler() {
        final Thread.UncaughtExceptionHandler originalHandler = Thread.getDefaultUncaughtExceptionHandler();
        try {
            final Thread.UncaughtExceptionHandler handler = (t, e) -> {};